Re: [ECOS] question about EB55

[RomanJordan at gmx dot de]

Thanks a lot for your help.
I think, the HTML-link is newer then my pdf (i downloaded the ecos sources
for three days!). I generated the pdf-manual. There i found that i have to
load ram version, change jumper setting to user, download rom srec file, burn
rom image to 0x01100000. I think that is wrong (see my last mail).
At the html site is it like that, as I expected it. The jumper is changed
after writing to 0x0110.0000. Not before writing, like the pdf is telling me.
I will check my pdf again.

Thanks, Roman

> "Greg Holdren" <greghol@sbcglobal.net> writes:
> 
> > ----- Original Message -----
> > From: Roman Jordan <RomanJordan@gmx.de>
> > To: Ecos Discuss <ecos-discuss@sources.redhat.com>
> > Sent: Sunday, August 03, 2003 1:57 PM
> > Subject: [ECOS] question about EB55
> > 
> > 
> > > Hi,
> > > i have downloaded the ecos image for the atmel eb55 board. The ram
> > > version is running fine. But i have a question about flashing the rom
> > > version of redboot. I do not want to delete the angel bootloader.
> > > If i read the manual at page 93 (pdf page 195) i read the following.
> > > Download the ram version, switch the jumper to position user. This
> will
> > > invert the address line A20. In my opinion angel is then located at
> > > 0x0110.0000. The free flash space is located at 0x0100.0000. I hope
> this
> > > is correct.
> > > Now i load the rom-srec file to ram. After this the manual says, write
> > > the downloaded rom image to adresse 0x0110.0000. Is this really
> correct?
> > > The jumper is already in the user position. I think there is angel
> now.
> > >
> > > I think i have to write the rom image at the address 0x0110.0000 and
> > > then switch the jumper jp1 to user position.
> > 
> > 
> > This procedure works for the EB40A and the EB55. I have used it and it
> works
> > on both boards.
> > 
> > http://sources.redhat.com/ecos/docs-latest/ref/at91.html
> > 
> > The jumper should be in STD mode the whole time because you need angle
> to
> > communicate with the board. Switch jumper to USER and reboot once the
> flash
> > is programmed with redboot.ROM.
> > 
> 
> To underline this. We discovered, the hard way, that the jumper/switch
> on these boards only apears to affect read cycles. Any write cycles to
> the flash continue to go to the original addresses. So writing to
> 0x01000000 with the jumper in USER mode actually writes to the Angel
> half of the flash.
> 
> The only really safe way to program these boards is to load a RAM
> RedBoot from Angel, run it, load a ROM RedBoot into memory, and then
> program that into the flash at 0x01100000.
> 
> -- 
> Nick Garnett                    eCos Kernel Architect
> http://www.ecoscentric.com      The eCos and RedBoot experts
> 
> 
> -- 
> Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
> and search the list archive: http://sources.redhat.com/ml/ecos-discuss
> 

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